he LPC932 can be used to create a Pulse Width Modulated pWM signal. That s an analog signal, with only 2 discrete levels, for example 0V and 5V and a constant period. The current value of this signal at a certain poiTnt of time is proportional to its Duty Cycle. That s the High Time during one period divided by the period. It can also be calculated as the average value during a particular period. That means after low pass filtering, (e.g. RC circuit) the signal becomes analog, with an actual value controlled by the microcontroller. The pWM functionality enables the LPC932 to control for example the speed of DC motors or the brightness of electric lighting.
標簽：
signal
Modulated
analog
create
上傳時間：
2015-05-14
上傳用戶：CHINA526
